Stove.



Patented Sept; l9, I899. B. GALBRAITH.

STOVE.

(Application filed Nov. 8, 1898.)

3 Sheets8heet 2,

(No Model.)

Patented Sept. I9, I899. R. GALBRAITH.

8 T 0 V E (Application filed Nov. 3, 1898.1

3 Sheets-Sheet 3,

(No Model) M55555 %Z4W MJZW we mums mus c0, worm Wanner-Ton n c.

lhvrrnn STATES PATENT OFFICE.

ROBERT GALBRAITH, OF LANSINGBURG, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO EDWARD J. BERlVIND AND \VILLIAM DE LANCEY \VAL- lRlDGE, TRUSTEES, OF NEXV YORK, N. Y.

STOVE.

SPECIFICATION forming part of Letters Patent No. 633,556, dated September 19, 1899. Application filed November 3,1898: Serial No. 695,378. (No model.)

To to whom it 77%01/007'006'7:

Be it known that 1, ROBERT GALBRAITH, of the village of Lansingburg, county of Rensselaer, and State of New York, have invented new and useful Improvements in Stoves, of

which the following is a specification.

My invention relates to that class of stoves in which a downward draft is used to burn the fuelcontained in a fire-pot; and my invention to more particularly relates to an applied means of introducing the downward draft of 'air through the fire-pot by means of tubes combined with a damper by which the measure of air so entering may be regulated; and my :5 invention also relates to a manner of constructing the fire-pot to adapt it to use a downward draftof air, as will be more fully described hereinafter, in connection with its illustration, and detailed in the claims.

hen in downwarddraft stoves the firepot has a vertically grated or slotted lower zone and the descending force of the draft impulse is spread out over the whole top surface of the fuel in the fire-pot, the'draft force will seek its most direct and least obstructed route to the exit, and thus merely enter the fuel enough to secure a lateral passage to the grated sides of the lire pot and from thence to the exit, and so leave a large portion of the fuel in the tire-pot unacted upon. When, however, the draft impulse forces the air-currents down through a series of tubes, these currents penetrate the fuel, so as to bring the whole of it under the draft intiuence, and thus adapts for use a tire-pot having a grated lower zone for the lateral passage of heat and flame and a grated bottom for the discharge of ashes. Besides these desired results the smoke and odors evolved at the commencement of the combustion are caused to pass through the fuel and be consumed.

Accompanying this specification to form a part of it there are four sheets of drawings containing seven figures illustrating the application of my invention with the same designation of parts by letter-reference used in all of them.

Of these illustrations, Figure 1 is a central vertical section of a stove containing my invention. Fig. 2 is a transverse section taken on the line a" so of Fig. 1. Fig. 3 is another transverse section taken on the line 415 00 of Fig. 1. Fig. 4is a top view of the stove, shou ing at :0 0: the section-line on which Fig. 1 is taken. Fig. 5 is a top view of that part of the stove-top in which the draft-tubes are located and in which the annular damper is placed with part of the damper-plate shown as broken out. Fig. 6 is a perspective of a broken-out part of the lower zone of the fire- 6o pot illustrated at Figs. 1 and 2, showing a firebrick inserted in one of the bars between two of the vertical openings therein with one of the bricks shown as detached, and illustrated in perspective and enlarged proportion at Fig. 7.

The several parts of the apparatus thus illustrated are designated by letter-reference, and the function of the parts is described as follows:

The letters designate the outer wall of the stove; T, the stove-top; B, the base, and L the legs, on which the base is supported.

The letter A designates the ash-pit, and G the grate, resting upon the plate P.

The letter O designates the combined fuel and draft chamber, and 10 the wall inclosing it.

The letter F designates the fire-pot, formed with the two zonesf andf and the letterf 8o designates an annular flange formed on the upper edge of the lower fire-pot zone f to receive and support the upper fire-pot zone f. The latter is recessed interiorly at- R to receive fire-brick by means of an annular flange 10 formed on the bottom of the wall 10 of the chamber 0, and the flange f formed on the casing C of the upper fire-pot zone f.

The letter I designates a dome formed in the stove-top, and 1 a feed-passage for fuel.

The lower zone of the fire-pot (designated atf?) has vertical openings 0, formed in its side between its top ring 0 and its bottom ring 0 and between these vertical openings 0 there are bars 11 which at their ends are integrally formed with the rings 0 and O and which bars at their sides where laterally extending inwardly are dovetailed at I) to re ceive the bevels '0 of the fire-brick V, by the insertion of which the bars b are protected from the action of the passing heat and flame.

The letter J designates a jacket-flue arranged between the fire-pot F, the wall of the chamber 0, and the outer wall W of the stove, and the letter P designates a draftdeflecting flue-plate which is arranged in said flue J laterallyto incline downwardly at each of its ends, as shown at Fig. 1, and made to extend half-way around the chamber 0, as shown at Fig. 2, whereby the passage of the heat from the fire to the exit-pipe E maybe equalized and not direct to. the exit from such of the vertical passages O as are nearest to it.

The letters T designate the draft-tubes, of which there are a series arranged in a circle in the stove-top T, with the discharge ends of the tubes designated at t and shown as projected downwardly within the chamber 0. Each of these tubes has an annular flange 25 on its upper edge, adapted to rest on the recessed edge of one of the openings '15, formed in the stove-top, in which the tubes are inserted, whereby the tubes can be removed and new ones put in their place, it impaired by use.

The letterD designates an annulardamperplate provided with a downwardly-projected guide-flange d on its outer edge, and as so formed thereat it is adapted to overlap an annular projection d upcast from the stove-top outside of where the latter has formed in it the openings for the draft-tubes. This annular damper is constructed with a slotted guide S, and the letter p designates a guidepin that is upwardlyprojected from the stovetop through said slot, (shown at Figs. 4 and 5,) and this damper is provided with draftpassages N, by which as said damper is moved around until the openings N register with the open tops 02 of the tubes T then air under a draft impulse will pass down through all of the tubes to the fire at the same time to maintain combustion of the fuel in the firepot with the products of combustion passing out through the vertical openings 0 in the lower part of the fire-pot to enter the fine J and pass through the latter to the exit-flue E. The draft-damper B as constructed acts to open or close allthe entry-ports of the tubes T at the same time. As thus constructed, by means of the tubes T arranged in series, the draft force is carried down into the fuel in jets, so as to penetrate it and bring all the coal within the fire-pot under the draft influence. This construction and arrangement of draft-tubes makes available for use the fire-pot F, having the vertically-grated bottom zone f for the passage of the heat and flame and the bottom grate G for the discharge of the ashes.

The grate G is merely used to support the fuel in the fire-pot and to discharge the ashes produced by the combustion of the fuel into the fire-pot ash-pit, and on this account the grate G has quite narrow passages.

\Vhile I prefer to make the fire-pot F in two transversely-divided parts, it may, if desired, be made in a single piece of casting.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a downdraft-stove the combination with a fire-pot proper having a fire-chamber arranged above the latter; of an an'nularlyr constructed and vertically grated supplemental fire-pot portion depending from the lower end of the fire-pot proper, and having vertically-placed grate-bars each constructed with a recess adapted to contain fire-brick; a chamber surrounding said fire-pot and firechamber, and at its upper end provided with an exit-pipe; and a series of draft-tubes arranged in said stove-top so as to depend therefrom within said fire-chamber; and an annular damper arranged in said stove-top whereby said draft-tubes may be simultaneously opened and closed, substantially as and for the purposes set forth.

2. In a downdraft-stove the combination with a fire-pot proper having a tire-chamber upwardly extended therefrom, and provided with a top, of an annularly-constructed and vertically-grated supplemental fire-pot portion depending from the lower end of the firepot properand having vertically-placed gratebars each constructed with a recess that is adapted to contain fire-brick; a chamber surrounding said fire-pot and firechamber and at its upper end provided with an exit-pipe, and having a deflecting-plate arranged transversely within said last-named chamber made to extend from the exit-pipe side of the latter downwardly; and a series of draft-tubes arranged in said stove-top so as to depend therefrom within said fire-chamber; and an annular damper arranged in said stove-top, whereby said draft-tubes may be simultaneously opened or closed substantially as, and for the purposes set forth.

Signed at the city of Troy, this 12th day of September, 1898, in the presence of the two witnesses whose names are hereto written.

ROBERT GALBRAITH. 

